add -fvisibility=hidden to CC flags, mark XXX_main functions
EXTERNALLY_VISIBLE. 5% size reduction of libbusybox.so

diff --git a/console-tools/reset.c b/console-tools/reset.c
index deffe286..bb096cf 100644
--- a/console-tools/reset.c
+++ b/console-tools/reset.c
@@ -12,7 +12,7 @@
 
 #include "libbb.h"
 
-int reset_main(int argc, char **argv);
+int reset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int reset_main(int argc, char **argv)
 {
 	if (isatty(1)) {